Polymer translocation through a hole
Polymer translocation through a hole
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DOI：
10.1063/1.480386
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发表时间：
1999-12-08
影响因子：
4.4
通讯作者：
Muthukumar, M
中科院分区：
文献类型：
--
作者：
Muthukumar, M
计算了在化学势梯度下长度为N的聚合物通过窄孔的平均停留时间τ。在所提出的模型中，孔的细节参数化的速率常数k（0）传输单体穿过孔，独立的链长。我们表明，在整个孔的聚合物的平均构象的任何不对称性是足以产生的驱动力的聚合物易位。如果不存在化学势梯度，则τ类似于N-2，比例常数取决于易位前后聚合物的尺寸指数。对于沿着迁移，化学势梯度Δ μ，τ分别与N（T/k（0）Δ μ）和N-2/k（0）成比例，对于大和小的N Δ μ/T。对于逆化学势梯度的易位，τ类似于长聚合物的exp（N）。(C)1999年美国物理学会。[S0021-9606（99）50946-X]。
The average residence time tau of a polymer of length N passing through a narrow hole under a chemical potential gradient is calculated. In the proposed model, details of the hole parametrize the rate constant k(0) for transporting a monomer across the hole, independent of the chain length. We show that any asymmetry in the average conformations of the polymer across the hole is sufficient to generate the driving force for the polymer translocation. If chemical potential gradient is absent, tau similar to N-2, with the proportionality constant depending on the size exponent of the polymer before and after the translocation. For translocation along the chemical potential gradient Delta mu, tau is proportional to N(T/k(0)Delta mu) and N-2/k(0), respectively, for large and small N Delta mu/T. For translocation against the chemical potential gradient, tau similar to exp(N) for long polymers. (C) 1999 American Institute of Physics. [S0021-9606(99)50946-X].